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@gnuvince gnuvince/gist:58942
Created Feb 5, 2009

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(def brackets (zipmap "([{<" ")]}>"))
(def opening-brackets (set (keys brackets)))
(def closing-brackets (set (vals brackets)))
(defn- check-aux [[x & xs] stack]
(if x
(cond (opening-brackets x) (recur xs (conj stack (brackets x)))
(closing-brackets x) (if (= x (peek stack))
(recur xs (pop stack))
:else (recur xs stack))
(empty? stack)))
(defn check-brackets [s]
(check-aux s []))
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